MCP, MCP server
Mcp Stdio
Mcp Stdio, an MCP server listed in the PlugVet directory.
Compatibility: Not stated.
Grade C
One Medium finding. Read the report before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
NETWORK_HOST_FROM_INPUT
Why this grade
- NETWORK_HOST_FROM_INPUT Medium
A file takes a URL or endpoint as input and has no fixed host list.
tests_integration/conftest.py, line 298
with socket.create_connection(("127.0.0.1", port), timeout=0.1):
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Note
requests shell access. The manifest names this permission.
PERMISSION_SHELL_DECLARED
tests_integration/_stdio_client.py, line 51
proc: subprocess.Popen,
tests_integration/conftest.py, line 237
return subprocess.Popen( # noqa: S603 - fixed argv, no shell
tests_integration/conftest.py, line 444
def __init__(self, proc: subprocess.Popen, port: int, stderr: _StderrDrain) -> None:
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tests_integration/conftest.py, line 597
proc = subprocess.Popen( # noqa: S603 - fixed argv, no shell
tests_integration/test_stdio_client.py, line 46
"""Minimal stand-in for `subprocess.Popen`, driven through `close()`.
src/mcp_stdio/server.py, line 2377
self._proc = subprocess.Popen( # noqa: S603 - operator-supplied argv
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Serious
accepts a host from input, with no fixed list in this file.
NETWORK_HOST_FROM_INPUT
tests_integration/conftest.py, line 298
with socket.create_connection(("127.0.0.1", port), timeout=0.1):
tests_integration/conftest.py, line 474
return httpx.post(
tests_integration/conftest.py, line 490
return httpx.request("DELETE", self.url, headers=merged, timeout=timeout)
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tests_integration/conftest.py, line 526
resp = httpx.post(
tests_integration/test_serve_legacy_pin.py, line 421
sessionless = httpx.get(serve_gateway.url, timeout=10.0)
tests_integration/test_serve_legacy_pin.py, line 425
unknown = httpx.get(
tests_integration/test_serve_legacy_pin.py, line 470
sock = socket.create_connection(("127.0.0.1", serve_gateway.port), timeout=10)
tests_integration/test_serve_modern_before.py, line 262
sock = socket.create_connection(("127.0.0.1", gateway.port), timeout=10)
tests_integration/test_serve_modern_e2e.py, line 127
return httpx.post(
tests_integration/test_serve_modern_e2e.py, line 167
resp = httpx.post(
tests_integration/test_serve_modern_e2e.py, line 196
resp = httpx.post(
tests_integration/test_serve_modern_e2e.py, line 319
resp = httpx.post(
tests_integration/test_serve_modern_e2e.py, line 407
resp = httpx.post(
tests_integration/test_serve_modern_e2e.py, line 527
resp = httpx.post(
Secrets
Note
reads an environment variable.
SECRETS_ENV_READ
src/mcp_stdio/cli.py, line 894
else os.environ.get("MCP_BEARER_TOKEN", "")
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
uv.lock, line 1
version = 1
src/mcp_stdio/relay.py, line 1
"""Core relay logic: stdin JSON-RPC -> HTTP POST -> stdout."""
src/mcp_stdio/server.py, line 1
"""Reverse gateway: expose a local stdio MCP server as a Streamable HTTP endpoint.
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tests/test_oauth.py, line 1
"""Tests for mcp_stdio.oauth module."""
tests/test_relay.py, line 1
"""Tests for mcp_stdio.relay module."""
tests/test_server_modern.py, line 1
"""Serve's modern request-plane validation ladder (#270 Phase 3 P3-A).
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit b3b152f7dbf9. requests shell access. The manifest names this permission. accepts a host from input, with no fixed list in this file. reads an environment variable. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: b3b152f7dbf9c6d9d794d7dc84bca1eac415525d
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